Wood burning furnace



Dcc. 1, 1931. T. E. CLARK WOOD BURNING FURNACE Filed Jan. 28, 1929 flTTUR/VE/ Patented Dec. 1, 1931 UNIT D STATES PATENT OFFICE]! antennas is. CLARK, on MILWAUKIE, OREGON, ASSiIGNOR 'ro GORDON N. CLARK, or

. MILWAUKIE, OREGON a r I woon BURNING FURNACE np ucatibn filed fan a es, 1929. Serial No. 335,441.

'This invention relates generally to heating appliances, and particularly to those especially adapted to the burning of wood.

The main object of this invention is to provide a wood burning furnace possessing the natural advantages of a circular fire pot without the disadvantages arising from the fact that wood often hangs up on the sides of a round fire pot causing the fire to die down.

The second object is to employ an elevated base for the purpose of reducing the distance to which one must stoop to fire the furnace, and to greatly improve the circulation thereof.

The third object is to reduce the total weight of a furnace of a given capacity, but to increase the weight of those portions of the furnace coming in direct contact with the heat, which are ordinarily the first to give out.

These, and other objects, will become more apparent from the specification following as illustrated in the accompanying drawings, in which:

Figure 1 is a partial vertical section through a furnace in which my device is employed. Figure 2 is a horizontal section taken along the line 22 in Figure 3. Figure 3 is a vertical section taken along the line 3-3 in Figure 1. Figure 4 is a perspective view of the fire pot. Figure 5 is a perspective view of the base.

Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to the drawings, there is illustrated a base which is somewhat rectangular and having one rounded end 11,

which base is held at an elevated position by means of the legs 12. Around the sides 13 and the end 11 of the base 10 is formed a channel 14, and on the under side of the front edge 15 are formed the bolt lugs 16. v The legs 12 rest upon the floor 17.

Upon the base section is placed the fire pct 18 which is somewhat cylindrical in form, although preferably tapering slightly toward the bottom, and having the sides 19' of its bottom flattened out to form a straight line which is in the same plane as the wings 20, which are cast integral with the fire pot 18.

is now the practice.

A tongue 21 is formed along the lower edges of the portions 19 and and around the rear 22 of the fire pot 18. This tongue conforms with the channel 14, and in practice I I would of course be laid incement;

I The front edges 23 of the wings 20 are flush with the front edge 15 of the base 10. Around the top of the fire pot 18 is formed a channel 24 which extends all the way around i the fire pot'and along the top of the wings 20 to the front edges 23.

It will be noted that the left side of the opening formed between the wings 20 is provided with an offset 25 to make room for the water coils 26, which are directly above same.

' It will'also be noted that the space between the wings 20 now constitutes the passage through which fuel 27 can be fed into the fire pot without droppingsame into'the fire, as is the usual practice where the fire pot is a complete cylinder.

to the shape of the present feed section of Thelower edge of the existing furnaces. section 28 is provided with a'tongue 29 which extends into the channel 24. Obviously, there is now no need for an opening into the section 28, but the section18 is provided with the double doorsSO and 3l,'the door 31 being provided with a damper 32which can be controlled from the floor above by a chainc33as The outer casing 34 is bolted against the edges-l5 and 23 and rests upon the base ring 35, which completely encloses the heating section of the furnace.

' The usual cold air inlet 36 is of course placed nearthe bottom of the section 34 and will admit cold air to the under side of the base 10, not only carrying away its heat but protecting same against destruction by overfiring, and sincethe ability of a furnace to circulate air depends largely upon the difference in temperature between the air' at the point of inlet and outlet of the furnace, it

can be seen that this function will be performed in the best possible manner, owing to the fact that the cold air is taken directly into the furnace and almost instantly heated causing same to rise rapidly and naturally pass outto the rooms being warmed in a relatively-shortspace of time, causing an ideal circulating action. 7

t will also be noted that fuel in the form of wood27 can be placed" directly upon the floor or base in full sight of the operator, and also that there is no tendency to hang up on the side walls, as must be the case where the fire pot is a complete tapering cylinder. It can be seenthatby permitting the air to pass underneath the fire box that the heat radiating area. of the furnace is greatly inhaving apair ofparallel wings formed along the sides of said opening, the lower portion of said conical part having angularly flattened faces formed thereon the lower edges of which form continuations of the lower edges of said wings, the. entire top edge of said cylindrical section and wings having a continuous channel formed therein.

THOMAS E. CLARK.

creased, the result being a transfer of the heat from the fuel to the air being warmed without super-heating of any portion of the currents.

tion escape from the fire pot 28 through the air or furnace.

In other words-all of the heat extracted from the fuel is distributed over a relatively large area of metal from which it is carried away bythe passing air The gaseous products of combussmoke outlet pipe 27 which passes through the outer casingSet and connects directly with the fire pot 28.

I claim: 7

L A wood burning furnace having a base constituting a floor upon which the fuel is burned, a circular fire pot mounted on said base, said fire pot having an opening in the side thereof, said opening having parallel vertical sides the full height of the fire pot through which fuel can be fed thereto, and

a closure for said opening.

2. In a wood burning furnace, a circular fire pot having opposite sides thereof fiattened along the lower edges and converging to form a pair of straight bottomed edges,

and a pair of extensions integral with said fire pot forming an entrance thereto in continuation of said lowermost side edges and extending the full height of said fire pot, said extensions lying parallel to each other in vertical positions.

, 3. Abasefor wood burning furnaces con- SlStHlg' of a flattened surface upon which wood can be burned, means for elevating said flatsurface for the circulation of air under said base, a fire pot section constituting a. frusto-conical member mounted on said 

